Unlike the usual approval of a car seat, the Plust test is a marking that is voluntary and it is up to the manufacturer to plus test the car seat or not. A Plus Tested car seat ensures that your child is not exposed to life-threatening high neck forces in a frontal collision. Today, all Axkid’s rear – facing car seats are plus tested and approved: Axkid ONE, Axkid Minikid 2, Axkid Move, and Axkid Modukid Seat. For more information about the Plus test, click here »